new tree file format

src/utils.hpp

@@ -25,6 +25,14 @@
 
 void init();
 
+struct MappedFile
+{
+	char* data;
+	unsigned len;
+};
+
+MappedFile mapfile(const char* path);
+
 template <class Vec>
 void remove(Vec& vec, size_t pos) /* Remove from vector by moving the last element in its place */
 {